linux-kernel - Re: [PATCH v10 1/2] x86/tdx: Add TDX Guest attestation interface driver

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Date:   Wed, 24 Aug 2022 19:10:10 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kai Huang <kai.huang@...el.com>,
        Wander Lairson Costa <wander@...hat.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        marcelo.cerri@...onical.com, tim.gardner@...onical.com,
        khalid.elmously@...onical.com, philip.cox@...onical.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 1/2] x86/tdx: Add TDX Guest attestation interface
 driver

On Wed, Aug 03, 2022 at 05:33:22PM -0700, Kuppuswamy Sathyanarayanan wrote:
> In TDX guest, attestation is used to verify the trustworthiness of a TD
> to other entities before provisioning secrets to the TD. Such attestation
> process is required by 3rd party servers before sending sensitive
> information to TD guests. One usage example is to get encryption keys
> from the key server for mounting the encrypted rootfs or secondary drive.

Just a reminder to fix this up wrt TDX and TD. I know Intel
documentation wants to talk about trust domains and the guest being one
but then if you wanna formulate it that way, you need to define the
nomenclature you're using and then stick with it.

Otherwise, confusion.

Example: "In TDX guest, ... Such attestation... before sending
information to TD guests."

And here I go: What, there's a TDX guest and TD guest?

Just simplify it.

I'll review our v11 properly after you've addressed comments from v9 too.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette